Improvement in slide-valves



. SPECIFICATION. e We,'F. GLAssON, ofthe city of New York, in the countyand `Statejof New Yorlr,'and W. UGILFILLAN, ofthe city of Paterson, inthe county ofPassaic and State of New Jersey, i have invented certainImprovements in Steam- Valves forPumps, Src., of which the following eis a specification:

` This invention referstothat class of slidevalves used in steamforce-pumps or other steam engines, and which, being actuated by tappetsor stops on moving parts therein, are required to perform theirfunctions with as little lost motion of the tappets as possible, inorder to reverse the engine and pass the dead-Y point thereof; and theinventionl consists in the construction of the valve-seat and itsxed vabutment, and the combination with the latter of a valve of peculiarconstruction, which is reciprocated by the force of the steam actingbetweenit and the said abutment, as hereinafter described. e

e Description of Drawing."

In our drawing, Figuresl and 2 represent our improved valve-seat.` Figs.3 and 4 represent our improved valve seen from the under 4 part thereofand "in, section. Figs. 5 and 6 is the small valve used in connectionwith our valve to distribute the steam therein; and Figs. 7 and 8represent our improved slidevalve on its seat, seen in sectionalelevation and in two different positions thereof, so as to illustrateits workin g.v

General Description.

tion, working upon the ports G M P, so asV to admit or exhaust steamalternately through the ports Gr' P'. `M is the exhaust-port 5 M',theexhaust-pipe. B is thevalve-seat of our improved valve. This seat isplaned true on Vits face, and is provided with holes b to fasten it tothe cylinder of the pump or V'machine in which it is tobe introduced.V'Ihe seat B has two ports, D andE,whichare to communicate in theordinary way with the two ends of the steam-cylinder.` B' is an abutmentor partie and located between the two ports D and E. n `{I his abutmenthas straight sides opposite the UNITED ,STATES C is a little slide-valveof ordinary construe' `tion fastened to or forming part of the seat B,

PATENT OFFICE. l

e FREDERICK- `atAssoN,v or NEw YORK, N. Y., AND WILLIAM GILEILLAN, orrATEEsoN, NEw JERsEY.

IMPROVEMENT |N SLIDE-VALVES.

spcification forming part of` Letters Patent No. 129,v26,daed Julyea,1872.

ports D and E, but the sides h t and h' t' are made sloping in orderthat the valve A, which is to work over the abutment B', may it snuglyas well on the seat, on the sloping sides h t h' t', and 'on the top ofthe abutment B', and that all the rubbing surfaces may wear equally andmake a steam-tight joint. We have repre- Y sented the end view (Fig. l)of our abutment B' as being of rhomboidal shape, but the abutment B' maybe made of any desired shape which will allow of the valve A slidingfreely thereon in .the direction -to and from the ports D E withoutlosing steam. G' and P' are ports on the top of theabutment B'coinmmunicat` ing with the ports Gr and P of the seat B, whereon thesmall valve C is to work; but the valve may be placed anywhererelatively tothe valve A, provided always that the ports controlled bythe little valve willcommunicate with the ports Gr' and P' of theabutment B'.

On each side ofthe abutment B' are` exhaustports M M. 'A is theslide-valve, for distributin g steam to the ports D and E for working"the engine to which it is attached. This valve `A has on its face twolong exhaust-ports, I I,

to correspond to the ports D'and E, and two side ports, M' M', tocorrespond to the exhaustports M of the seat; andthese four ports on theface of the valve A communicate together and have no connection whateverwith the inside cavity of the valve A. Said cavity, being a counterpartof the abutment B', fits snugly thereon, allowing the valve to slide inthe direction of the arrows l and 2, Figs. 7 and 8, but being steamtighton the sloping sides h t h' t' of the abutment, on the top thereof also,as well as on the seat B. In the bottom of the hollow part of the valveAarecut two small cavities, TT', which correspond to the ports G' and P'of the abutment B', as and for the purpose described further. The valveA being placed overpthe abutment B', the little valvev being placed onits seat G M I?, and a steam-chest being placed over the whole, theoperation of our valve is as follows:

Operation of our Valve. n In Fig. 7 the steam is entering the port E,while the port D is exhausting through the port I, hollow valve A, portsM M to M',4 and the piston of the machine (not seen in the drawing) isworking in one direction, until the tappet, by moving the little valveC, or any other valve answering the same purpose, admits steam into theport I" through the cut T', between the side of the abutment B' and theside of the cavity of the valve A, driving said valve in the directionof the arrow No.1 until the cut T' passes the opening P', which cuts offthe steam, the valve A being in the position represented in Fig. 8. Thesteam is now entering the port D, while the port E is exhausting throughI (same as above) to M'" until, the small valve being moved, steam isadmitted through the port G' through T to space L, driving the valve Ain the direction of the arrow No. 2 and the space K, exhausting throughT' P' P' M to M' until the 'valve A is again as represented in Fig. 7,when the operation is repeated.

Claims.

Witnesses:

GEO. R. JAQUEs, E. GENGEMBRE HUBERT.

